Apparatus for pulling and racking tubing in vertical position



Jan. 6, 1959 w. slMMoNDs 2,867,338

APPARATUS FOR. PULLING `AND RACKING TUBING Filed DSC. 29, 1955 IN VERTICAL POSITION 5 Sheets-Sheet 1 INVENTOR. Way/7e l/V lmmonds.

BY M/w ATToR/vfxs.

Jan.v 6, 1959 w. w. slMMoNDs 2,867,338

APPARATUS FOR PULLING AND RACKING TUBING IN VERTICAL POSITION Filed Dec. 29, 1955 5 Sheets-Sheet 2 Jan. 6, 1959 w. w. slMMoNDs 2,867,338

APPARATUS FOR PULLING AND RACKING TUBING IN VERTICAL POSITION Filed Dec. 29, 1955 5 Sheets-Sheet 3 `v 922m Wayne W z'mmonds.

BY l mw/@M /4 TTOPA/EVS.

Jan. 6, 1959 w. w. slMMoNDs 2,867,338

APPARATUS FOR PULLING AND RACKING TUBING IN VERTICAL POSITION VFiled Dec. 29, 1955 5 sheets-sheet 4 IN VEN TOR.

Wayne H/mmona @wmfw Da( Jan. 6, 1959 w. w. slMMoNDs Y 2,867,338

APPARATUS FOR PULLING AND RACKING TUBING IN VERTICAL POSITION Filed Dec. 29', 1955 5 Sheets-'Sheet 5 `INVENTOR. Way/7e M45/mmm /TTOR/VEYS.

United States Patent Oiiice 2,857,338 Patented Jan. 6, 1959 APPARATUS FOR PULLING AND RACKING TUBING IN VERTICAL POSITION Wayne W. Simmonds, Tulsa, Okla., assigner to .lohn H. Lucas, as trustee Application December 29, 1955, Serial No. 556,322

Claims. (Cl. 214-25) This invention relates to a portable derrick for removing tubing from and placing the same in a well hole, and more particularly a device of that character wherein the tubing may be stacked in vertical position on a rack on the vehicle upon which the derrick is mounted until it is desired to be replaced in the well.

The principal objects `of the present invention are to provide a derrick mounted upon a trailer vehicle adapted to be attached to a truck, tractor or the like to be transported from place to place, and which derrick may be folded over the trailer vehicle for such transportation; to provide spaced standards on the derrick having endless chains mounted on the inside of the standards and having shafts which are mounted `between and carried by the chains at the maximum distance apart and to which are attached elevators for attachment to the tubing in the well hole for raising the same therefrom in successive movements; to provide a movable rack mechanism on the trailer vehicle adjacent the derrick portion of the apparatus whereby the tubing removed from the well with one elevator will be deposited in vertical position on the rack and at the same time the other elevator will be raising the next joint `of tubing from the well hole to the top lof the derrick and the first elevator depositing thetubing in the rack will be free to pick up the next successive piece of tubing after the preceding tubing is detached therefrom; to provide hydraulic mechanism on the vehicle for operating the endless chain in the derrick; to provide hydraulic means for movement of the rack mechanism `on the vehicle and trackways provided therein; to provide an endless chain for said rack mechanism whereby when one row of pipe is set in vertical position on the bar the rack may be moved away from the derrick for the next successive pipe receiving bar; to provide a frame on the vehicle in which the rack mechanism is adapted to engage and be slidable therein; to provide for adjustment of the chain and rack mechanism for the pipe; to provide means for synchronizing movement of the respective elevating chain on the derrick; to provide tracks on the derrick standards for the elevating chains and guides to prevent swinging of the chains; to provide means connected to the frame of the vehicle and to one of the endless elevating chains spaced for raising and lowering of the derrick on the vehicle frame; and to'provide means for locking the derrick in vertical position.

Further `objects of the present invention are to provide endless chain and bar mechanism having lugs or cones on said lbars for receiving the ends of tubing in spaced alignment on said bars to protect the threads on said tubing; to provide hydraulic means for movement of the rack bars in successive movement for filling as the tubing is pulled from the well; to provide endless chain means on the upper portion of the rack having spaced keepers thereon for receiving of spacer bars against which the upper portion of the tubing rests; to provide such spacer bars with keepers for spacing of the tubing one from the other; and to provide for rotation of the upper belt means in synchronization with the rack means at the bottom of the frame work of the vehicle.

Still further objects of the invention are to provide the derrick mast and brace frame of tubular construction for housing the hydraulic fluid for operation of the mechanism. Y

Other objects of the present invention are to provide a derrick having endless chains mounted therein having removable shafts at the respective ends; toy provide for suspending a pulley and cable mechanism from one of the shafts for bailing the Well hole after removal of the tubing; to provide for operation of the cable from a drum or winch carried by the vehicle; to provide a power unit and transmission means for operationv of the winch .or drum; to provide jack means under the vehicleframe and derrick for supporting the same while the device yis in use; and vto provide a device of this character economical to manufacture and eliicient in operation.

In accomplishing these and other `objects of the present invention, I have provided improved details of structure, the preferred forms of which are illustrated in the accompanying drawings, wherein:

Fig. l is a vertical, partly fragmentary endview of my apparatus showing one of the elevators attachedto the tubing as it leaves the well and the other elevator atltached t-o the tubing as it is being lowered on the rack mechanism.

"Fig, 2 is a side view of my apparatus.

Fig. 3 is an enlarged top plan View particularly illustrating the open crown construction of the derrick, the motors for operating the endless chain for raising and lowering the tubing, and means synchronizing movement of the chains.

Fig. 4 is a side view of my apparatus showing the derrick in lowered position on the vehicle.

Fig. 5 is an enlarged fragmentary partly cross sectional view particularly illustrating the upper portion of the derrick with the motor and gear connection with the endless chain.

Fig. 6 is an enlarged fragmentary disassembled view of the `guides for the endless chain on the inside `of the derrick standards and illustrating the cable and pulley mechanism used in connection with the baling operation.

Fig. 7 is a fragmentary partly cross sectional View of the derrick and chain assembly with the elevators attached to the tubing and one piece of the tubing being lowered onto the rack.

Fig. 8 is an enlarged fragmentary view of the frame mechanism and particularly ,illustrating the locking of the derrick in vertical position.

Fig. 9 is a fragmentary view particularly illustrating the cable and pulley means for raising the derrick to vertical position.

Fig. 10 is a fragmentary view showing the `cable and pulley varrangement when the derrick is in vertical position.

Fig. 1l is a perspective view of the pipe rackingmechanism.

Fig. l2 is an enlarged fragmentary `view ofthe upper frame rack mechanism.

Fig. 13 is an enlarged fragmentary view of the lower frame rack mechanism.

Fig. 14 is a fragmentary partly cross -sectional View illustrating the baler and cable mechanism for cleaning the well hole.

Fig. 4l5 is a diagrammatic view of the hydraulic mechanism for operating my apparatus.

Referring more in detail to the drawings:

lvdesignates a vehicle of trailer type mounted upon a pairvof dual wheels 2 and Shaving a framework 4 upon which the derrick or mast 5-is mounted. The trailervis 11 adapted to be attached to a truck, tractor or the like (not shown) for transportation.

The frame 4 has a pair of side members 6 and 7 of H-beam construction having webs, as indicated at 8, and top anges 9'and bottom flanges 10. The side members 6 and 7 have their rear ends secured by welding or other suitable means, as indicated at 11, to a cross bar 12 which extends outwardly from the side members and the side members also extend rearwardly of said cross bar, as best illustrated in Fig. 8. A pair of short vertical standards 13 land 14 are supported on the cross bar 12 on the outside of the side members 6 and 7 and secured to the upper ends thereof are plates 15 and 16 having openings in the upper edges thereof for receiving pins 17 and 18 for a purpose later described.

The forward end of the Vvehicle frame has uprights 19 "secured to the respective forward ends of the side members 6 and 7. Connecting the standards 13 and 14 and uprights 19 are side members 20 and 21, also shown to be of H-beam construction. Spaced vertical brace members 22 are provided in the. frame and slanting'b'races 23 to lend rigidity to the structure. The uprights 19 extend a short distance above the side members and 21, for a purpose later described.

24 and 25 designate tubular mast members for the derrick spaced from each other, and secured thereto spaced from the lower ends thereof are gusset plates 26 and 27 and 28 and 29 having forwardly extending portions, as indicated at 30 and 31, provided with openings 32 and 33 aligning with the openings in the plates 15 and 16 for receiving the pins 17 and 18 for pivotally mounting the tubular standards on the frame of the vehicle. Sleeved spacers 34 and 35 are provided between the gussets 15 and 27, and 16 and 28, respectively.

Welded or otherwise suitably secured to the upper end of each of the tubular standards 24 and 25 are plates 36, and welded to the underneath sides thereof are tubular members 27 and 38 which extend downwardly and forwardly to substantially the side members 20 and 21 of the framework when the mast is in vertical position. Mounted on the lower end thereof are substantially triangular shape gussets and 41 having openings 43 and 42 in the forward apex thereof. Also connected to the lower ends of the tubular members 37 and 38 are horizontal tubular members 44 and 45 having their rear ends rigidly secured to the uprights 24 and 25. Also secured to the lower ends 0f the tubular members 37 and 38 are downwardly extending tubular members 46 and 47 having their rear ends rigidly secured to the lower portion of the standards 24 and 25 to form a truss bracing for the derrick and also forming pressure line connection with the reservoir for the hydraulic fluid, formed by the mast members 24 and 25, as will later be described.

Secured to the sides of the H-beams 20 and 21 at substantially the top of the rear braces 22 and 23 of the frame are gussets 48 and 49 having openings 50 adapted to align with the openings 42 and 43 in the gussets on the` truss frame of the derrick for receiving pins 51 for locking the derrick in vertical position to the vehicle 4. The tubular uprights of the derrick form substantially an A-frame construction and are connected by a plurality of rods or tubular members 52. Secured to the outer end of the cross bar 12 are braces 53 and 54 having their upper ends engaging the pins 17 and 18 upon which the mast is pivotally mounted. Plates 55 and 56 are welded to the tubular braces 53 and 54 to provide for easy swinging of the mechanism.

Secured to the respective tubular members24 and 25 a substantial distance above the framework of the vehicle are gusset plates 57 to which are pivotally attached by pins or the like 58 short plates or arms 59. Pivotally seculred to the upright posts 19 on the forward end of the vehicle are standards 60. Rigidly secured thereto are gusset corners 61. Extending between the plates 59 and the corner gussets .61 are H-beams 62 placed on their n sides and the web 63 of the H-beam forming trackways for a purpose later described.

The upper end of the mast is provided with a crown, formed by the spaced plates 36 on the tubular members 24 and 25. Welded to the inner sides of the plates 36 at the rear thereof is a bar 64 providing a rigid connection between the plates 36. Secured to the upper faces of the bar 64 and plates 36 is an angle member 65. Welded or otherwise secured to the open side of the angle member 65, aligned with the outer sides of the bar 64 and plates 36, as indicated at 66, is a vertical plate 67 providing a rear wall of the crown. Welded to the outer sides of the plates 36 are triangular shaped side plates 68 and 69 adapted to provide side walls and additional rigidity of the crown structure, whereby their vertical rear ends 70 are secured to the outer ends of the plate 67. Mounted upon the plates 36 at their forward edges are L-shaped bosses 71 and 72 having their outer ends secured to the forward portions of the side plates 68 and 69.

Mounted on the plates 36, between the angle members 65 and 71-72, aregear housings 73 and 74 adapted to receive gears (not shown), supported on shafts 75 and 76 and extending through bearing members 77 and 78 which are carried by the inner sides of the plates 36 into the open crown, as best illustrated in Fig. 3. Rigidly secured to the rear side of the vertical plate 67 are hydraulic motors 79 and 80 having shafts 81 and 82 extending through the plate 67 and connecting with gears in` the housings 73 and 74 which in turn mesh with the gears on the shafts 75 and 76. Mounted `on the shafts 81 and 82 intermediate the 'end plate 67 and the rear walls of the gear housings are sprockets 83 and 84 over which an endless chain 85 is adapted to run for synchronizing rotation of the shafts 81 and 82 upon operation of the hydraulic motors 79 and 30 to the gears in the housings 73 and 74. v

Mounted upon the ends of the shafts 75 and 76 which extend in the open crown at the top of the mast, are sprockets 86 and 87. Also mounted on the inside of the tubular members 24 and 25 near the lower ends thereof, as illustrated in Fig. 7, are short shafts 88 and 89 to which are mounted sprockets 90 and 91. A pair of endless chains 92 and 93 are adapted to engage the respective sprockets 86 and 90, and 87 and 91, the movement of which is synchronized by the chain 85, as above mentioned. Track members 92 and 93' are rigidly secured to the insides of the vertical standards 24 and 25. The track members may be of any suitable construction but I have illustrated in Fig. 6 a U-shaped channel member welded to the tubular members. as indicated at 94.

Guides 95 are provided for fastening the chains 92 and 93 in spaced relation and are of substantially U- shaped construction having their arms 96 and 97 thereof flared slightly outwardly at the top to readily engage the tracks 92' and 93. The guides 95 have spaced openings 98 and 99 for receiving the end 160 of a shaft 101 and the end 102 of a chain link pin 102', as illustrated in Fig. 6, whereby the shaft 101 extends through a link of the chains 92 and 93 into the opening 98 and the pin 102 into the opening 99.

Pivotally mounted on the shaft 101 by spaced ears 103 is a plate 103 having an opening 104 near the center thereof adapted to receive a'pin 105 of a clevis 106 for attachment of an elevator 107 provided for engaging the end of a tubing for removing the same from the casing. A second elevator arrangement, as indicated at 108, having a shaft 109 is mounted between the chains 92 and 93 spaced from the elevator arrangement 107 substantially the same distance apart as the pairs of sprockets 86 and 87, and 90 and 91 also adapted to engage the end of a tubing and removing the same from the casing, as` illustrated in Fig. 1. y

Referring now to the pipe racking mechanism, l provide a frame 110 tting within the (side members 6 and 7 and engaging on the lower lnner anges 10 thereof. The frame comprises spaced outer plates 111 and 112, and 113 and 114 between which are rigidly mounted H-beams 115 and 116 connected by spaced rods 117 and 118. Secured to the outer ends thereof in the web portion 119 of the H-beams 115 and 116 are blocks 120 and 121 which engage the inner flanges 10 of the H- beams 6 and 7, as above stated. The outer ends of the plates 111 and 112, and 113 and 114 are provided with aligned openings adapted to receive a shaft 122. Mounted on said shaft between the plates are sprockets 123 and 124. Also mounted upon the shaft inside the plate 113 is a rsprocket 125, for a purpose later described.

Mounted on the inside of the H-beam 118 is a motor 126 having a shaft 127 leading to a Worrn gear 128 connecting with gears (not shown) in a gear box 129 mounted on the vshaft 122. The opposite ends of the side members 6 and 7 are provided in the web portions thereof with slots 130 and l131 just inside the cross bar 12 and adapted to engage therein is a shaft 132 upon which are mounted sprockets 133 and 134 for receiving endless chains 135 and 136 adapted to run over the sprockets 123 and 133 and sprockets 124 and 134 in alignment with the side members 115 and 116 of the frame 110. The upper plane surfaces of the H-beams 115 and 116 for trackways for the chains. The chains are of long link construction, as indicated at 137 (Eig. 13) and secured to each link thereof by riveting or other suitable means are slats or cross bars 138 o-n which are mounted in spaced relation a plurality of lugs of cone members 139 adapted to receive the ends 140 of the tubing 141, as indicated at 142 (Fig. 13).

The upper portion of the corner gussets 61 are provided with openings in which are mounted bushings indicated at 143 in which is mounted a shaft 144. Mounted upon the shaft 144 inside the gussets are sprockets 145 and 146 in alignment with the trackways 63 formed by the web of the H-beams 62. The plates 59 are secured to the gussets 57 of the mast and are provided with slots 147 in which are adapted to engage short shafts 148 and 149 upon which are mounted sprockets 150 and 151. Adapted to engage over the sprockets 145 and 146, and 150 and 151 are a pair of endless chains 152 and 153 and which are adapted to engage in the trackways 63 of the H-beam 62.

Rigidly secured to the links 154 of the chains 152 and 153 are U-shaped members 155 adapted to receive a bar 156 for spacing of the tubing 141 in alignment with the cones on the bottom part of the rack when a slat is lled with tubing. A plurality of pins 157 are provided for the bars 156 which extend outwardly from one side thereof to prevent the tubing from moving laterally into contact with each other. Mounted on the shaft 144 in alignment with the sprocket 125 on shaft 122 on the lower part of the rack is a sprocket 158 over which an endless chain 159 is adapted to run so that upon operation of the motor 126 the upper portion of the rack will be moved simultaneously with movement of the lower portion.

Mounted on the outside of the side members 6 and 7 over the slots 130 and 131 are plates 160 having slots aligning with the slots 130 and 131. Secured to the outside of the plate 160 along the slots therein are angleshaped guides 161 in which is slidably mounted a collar 162 in which the end of the shaft 132 engages. Secured to collar 162 is a threaded rod 163. Secured in the end of the guide member 161 is a threaded washer 164 through which the rod 163 extends and a head 165 is mounted thereon whereby rotation of the rod will -cause the shaft 132 to move longitudinally in the slots 130 and 131 and the side members 7 and 6 to adjust the lower chain rack mechanism.

Similar guides 166 having collars 167 and threaded rods 168, washers 169 and nuts 170 are provided on the outside of the plates 59 aligned with the slots 147 to 6 adjust the chains 152 and 153 o'n the upper portion of the rack member.

The frame 4 of the trailer vehicle 1 has a forwardly extending frame 171 rhaving sides 172 and a platform 173. Between the side 172 and underneath the platform 173 is winch or drum 174 for a cable 175. Mounted on the platform 173 is a power unit 176, a pump 177 and a 'storage reservoir 178. A brace 173 'extends from the'platform 173 to the top of the upright 19 supporting the platform of the vehicle. Mounted adjacent the power unit 176 is a transmission housing 179 for gears (not shown) rotating a shaft 180 extending from the gear housing and which has sprocket and chain connection with a shaft 181, as indicated at 182. The shaft 181 `is in driving connection with the Winch or drum 174 by a gear or chain arrangement (not shown) upon rwhich the cable is wound. A hook or eye member 183 is secured to the bar 12 at the back of the framework structure and mounted on the side of one of the upright standards 24 near the lower end thereof is a pulley 184. A cable 185 has a hook 186 connected with the eye 183 and the opposite end is run over the pulley 184 and the opposite end is provided with a hook 187 for attachment to one of the shafts 101 or 109 of the elevator arrangements, as illustrated in Figs. 9 and l0, for raising and lowering of the derrick, as will later be described. The pulley 194 is secured to the upright 24 vby a `bracket or the like 188. When the vehicle is moved to a location, jacks 189 may be placed under the forward portion of the vehicle and when the stanard or derrick is raised, jacks 190 are provided for placement under the vertical 'standards 24 and 25.

A Valve arrangement 191 is provided on the side of the derrick frame having levers 192 and 193 for op eration of the hydraulic motors for movement of the vertically extending chains in the derrick and the pipe rack mechanism.

Referring to the hydraulic system for operation of the mechanism, the Ypump 177 is connected to a valve 191 by a line 194. Line 195 leads from the valve 191 to branch lline 196 leading to motors 79 and 80 on the top of the derrick. Motors 79 and 80 are connected by a line 197 and a return line 198 leads from the line 197 to the valve 191. The Valve 191 has connection 199 with the valve 191" and the latter is provided for Operation of the motor 126 for the pipe rack mechanism. Line 201 leads from the motor 126 to the valve 191" and a return line 202 is provided between lthe valve and the motor. Line 203 leads from the valve 191l back to the reservoir and a lline 204 connects the reservoir with the pump 177. It will be noted that line 205 is connected to the tubular ltower braces 37 and 38 and to the motors 79 and 80, respectively, as illustrated in Fig. 2.

When the apparatus is moved to a well site, the jacks 189 are placed under the forward end of the vehicle frame 4 and the hook 186 will be attached to the eye 183 and the hook 187 yon the other end lof the short cable 185 will be attached the chain 93, as illustrated in Fig. 9. Operation of the motors 79 and 80 through valve 191 will cause the chain tomove in an upward or clockwise direction to move 'the cable '185 over pulley 184 to erect the derrick in vvan upright position, as shown in Fig. 10. The derrick is then locked in vertical position through pins 51, as illustrated in Fig. 8. To lower the mast, the pins are removed and the derrick moved off center by hand and operation `of the motors in reverse direction will cause the derrick-t0 be lowered to the frame structure, as illustratedfin'Fig. 4.

When the derrick is in upright position, -the cable 185 is removed from the elevator shaft and lthefframe -of the derrick so that the apparatus `may be cleared for use. The jacks y190 are :placed under the uprights 24 and 25 when the apparatusis in lposition and the elevator 7 108 attached to the tubing 141 in the well, as illustrated in Fig. 1. Operation of the motors 79 `and 80 through valve 1917wil1 cause the chains 92 and 93 to be raised4 in a clockwise direction over the sprockets 86 and 87, and 90 and 91 to raise the tubing to the crown of the derrick so that it will start its downward movement, as shown in Fig. 7. The elevator 107, when it reaches thelowermost position, will be attached to the next joint of tubing 141', the tubing 141 on its descent assisting in the raising of the tubing 141 from the well hole.

Tubing 141 as it nears the rack mechanism, the forward end is swung slightly from the derrick, as best illustrated in Fig. 7, and the lower end is engaged upon the lug or cone 139 of the slat 138. The elevator 108 is then released from the upper portion of the pipe and the pipe stood in upright position engaging between a pair of pins 157 on the cross bars 156, as illustrated in Fig. 11. This operation is repeated until the slats 138 are filled with the standing pipe, also as illustrated in Fig.` 11, when it is necessary to move the rack frame so that said chains will rotate at exactly the same speed so that the elevators will be raised in horizontal position.

I have provided each of the gusset plates 57 with a pair of idler sprockets 206 and 207 on short shafts 208 and 209 to compensate wear of the chain through use, as illustrated in Fig. 7.

When all of the tubing is removed from the well and placed on the rack, the well may be cleaned or otherwise worked upon as desired. When it is ready for replacement of the tubing, the operation, as above described, is reversed, i. e., the elevator 108 is attached to the top of the tubing 141 and is lifted from the rack moving in the reverse direction from that described for removing the tubing from the well. When the tubing is being replaced, the chains 92 and 93 will be moving in an anticlockwise direction and when the elevator 108 is placing the tubing 141 in the well, the elevator 107 maybe engaging the top of the next succeeding pipe on the rack to lift it therefrom to go to the well hole.

In Figs. 6 and 14, I have illustrated mechanism for cleaning a well with a baler or the like after removing the tubing therefrom. With this apparatus, theV elevators 107 and 108 are removed from the clevises 106 and a frame 210 secured thereon through an eye 211 which includes inwardly and outwardly extending arms 212 having bars 213 and connected by shaft 214 on which a pulley or sheave 215 is rotatably mounted, A U-shaped frame 216 has arms 217 and 218 having connection with the eye 211, provided with openings, as indicated at 219, for engaging the shaft 214. The bars 213 0f the frame 210 are welded to enlarged guides 95 whereby the guides 95 engage over the chains 92 and 93, as indicated at 220,` and the track members 92 and 93 holding the framework in position. The cable 175 from the drum 174 extends over a pulley or sheave 221 mounted on the bottom of the cross bar 12 of the frames structure, as illustrated in Fig. 14. The free end extends over the sheave 215 and has its end secured to a bale 222 of a baler 223. Operation of the power unit through the gears in the transmission housing and the sprocket and chain connection 182 with the gears connected to the winch or drum 174, will raise and lower the baler in the well for cleaning the same. When this operation is completed, the baler mechanism is disengaged by removal of the baler from the cable and the frame 210 from the.clevis.106 and the :elevators 107 and 108 may be replaced on the endless chains for use in' removing or placing tubing inthe well hole, 'as heretofore described.

What I claim and desire to secure by Letters Patent is:

1. Apparatus for servicing a well by moving tubing and rods to and from same comprising, a mast having spaced substantially upright standards for positioning on opposite sides of a well hole to be serviced, said standards being connected at their upper and lower ends, axially aligned( upper shafts adjacent the upper ends of the standards, means supporting said aligned shafts on said standards with the adjacent ends of the shafts spaced apart, axially aligned lower shafts carried by the standards adjacent the lower ends thereof withv they adjacent ends of said lower shafts spaced apart, pairs of sprockets on the respective ends of the upper and lower shafts, pairs of endless chains having pivotallyconnected'links operating over the respective aligned `upper and lower Sprockets, each chain having a path of movement in a vertical plane defined by the upper and lower sprockets with the planes of the paths of movement of the pairs of chains parallel and on opposite sides of the well hole to be serviced, an elevator, means attached to the respective chains and adapted to travel `therewith for pivotally suspending the tubing elevator between said chains, said sprockets being positioned relative to the well hole whereby the chains each have one run in a vertical plane and the elevator when suspended from said one run of the chains is movable in alignment with said well hole and when suspended from 4the other run of said chains is movable in a plane spaced from the well hole, and power means operatively connected with the upper sprockets for rotating same and effecting simultaneous movement of the chains for raising and lowering the tubing elevator.

2. Apparatus for servicing a well by moving tubing therefrom and racking same comprising, a mast having spaced substantially upright standards for positioning on opposite sides of a well hole to be serviced, said standards being connected at their lower ends, a crown member at the top of the mast connecting the upper ends of the standards, axially aligned upper shafts adjacent the upper ends of the standards, means supporting said aligned shafts on said standards with the adjacent ends of the shafts spaced apart, axially aligned lower shafts carried by the standards adjacent the lower ends thereof with the adjacent ends of said lower shafts spaced apart,

pairs of sprockets on the respective 'ends of the upper and lower shafts, pairs of endless chains having pivotally connected links operating over the respective aligned upper and lower sprockets, each chain having a path of movement in a vertical plane defined by theV upper and lower sprockets with the planes of the paths of movement of the pairs of chains parallel and on opposite sides of the well hole to be serviced, a tubing elevator, means i attached to the respective chains and adapted to travel therewith for pivotally suspending the tubing elevator between said chains, said sprockets being positioned relative to the well hole whereby the chains each have one run in a vertical plane extending through the well hole and the elevator when suspended from said one run of chains is movable in alignment with said well hole and when suspended from the other run of said chains is vmovable `in a plane spaced from the well hole, power means operatively connected with the upper sprockets for rotating same and effecting simultaneous movement of the vchains for raising and lowering the tubing elevator, and rack means having a tube end receiving portion at the lower ends of the standards and in the plane of said other run of the chains.

3. Apparatus for servicing a well by moving tubing therefrom and racking same comprising, a mast having spaced substantially upright standards for positioning on opposite sides of a well hole to be serviced, said standards being connected at their lower ends, a crown member at the top of the mast connecting the upper ends of the standards, axially aligned upper shafts adjacent the upper ends pf the standards, means supporting said aligned shafts on said standards with the adjacent ends i of the shafts spaced apart, axially aligned lower shafts carried by the standards adjacent the lower ends thereof with the adjacent ends of said lower shafts spaced apart, pairs of sprockets on the respective ends of the upper and lower shafts, pairs of endless chains having pivotally connected links operating over the respective aligned upper and lower sprockets, each chain having a path of movement in a vertical plane defined by the upper and lower sprockets with the planes of the path of movement of the pairs of chains parallel and on opposite sides of the well hole to be serviced, a horizontal shaft extending between the respective chains, means connecting said horizontal shaft to said links, a tubing elevator pivotally suspended from the horizontal shaft between the chains, said sprockets being positioned relative to the well hole whereby the chains each have one run in a vertical plane extending through the well hole and the elevator when suspended from said one run of chains is movable in alignment with said well hole and when suspended from the other run of said chains is movable `in a plane spaced from the well hole, track means on said standards in the vertical plane of said. one run of the chains, guide :means on the chains adjacent the horizontal shaft slidably engaging said track means, and power means operatively connected with the upper shafts for rotating same and effecting simultaneous movement of the chains for raising and lowering the tubing elevator.

4. Apparatus for servicing a well by moving tubing 'therefrom and racking same comprising, la mast having spaced substantially upright standards for positioning on opposite sides of a well hole to be serviced, said standards being connected at their lower ends, a ycrown member at the top of the mast connecting the upper ends of the standards, axially aligned vupper shafts adjacent the upper ends of the standards,V means supportingl said aligned shafts -on said standards with the adjacent ends of the shafts spaced apart, vaxially aligned lower shafts carried by the standards adjacent the lower ends thereof with the adjacent ends of said lower shafts spaced apart, pairs of sprockets on the respective ends of the upper and lower shafts, pairs of endless chains having pivotally connected links operating over the respective aligned upper and lower spr-ockets, each chain having a path of movement in a vertical plane dened by the upper and lower sprockets with the planes of the paths of movement of the pairs of chains parallel and on opposite sides of the well hole to be serviced, a tubing elevator, means attached to the respective chains and adapted to travel therewith for pivotally suspending the tubing elevator between said chains, said sprockets being positioned relative to the well hole whereby the chains each have one run in a vertical plane extending through the well hole and the elevator when suspended from said one run of chains is movable in alignment with said well hole and when suspended from the other run of said chains is movable in a plane spaced from the well hole, power means operatively connected with the upper sprockets for rotating same and effecting simultaneous movement of the chains for raising and lowering the tubing elevator, a plurality of lower support units to support a corresponding plurality of rows of stands of tubing, each of said units having portions adapted to receive the lower ends of stands of tubing, said support units being movable to and from a receiving position 10 f at the lower ends `of the standards and in a plane of said other run of the chains, a corresponding plurality of upper rack units to receive upper portions of rows of stands of pipe onl said lower'support units, and power means for moving said support -units and upper rack units to and `from tubing receiving position.

5. Apparatus for servicing a well by moving tubing y therefrom and racking same comprising, a mast having spaced substantially upright standards for positioning on n pairs of sprockets on the respective ends of the upper and lower shafts, pairs of endless chains having pivotally connected links `operating over the respective aligned upper and lower sprockets, each chain having a path of movement in a vertical plane dened by the upper and lowersprockets with the planes of the path of movement of the .pairs of chains parallel and on opposite sides of the well hole to be serviced, :a horizontal lshaft extending between the respective chains, means connecting said horizontal shaft to said links, a tubing elevator pivotally suspended from kthe horizontal shaft between the chains, said sprockets being positioned relative to the well hole whereby the chains each have one run in a vertical plane extending through the well hole and the elevator when suspended from said one run of chains is movable in alignment with said Well hole and when suspended from the other run of said chains is movable in a plane spaced from the well hole, track means on said standards in the vertical plane of said one run of the chains, guide means on the chains adjacent the horizontal shaft slidably engaging said track means, power means operatively connected with the upper shafts for rotatingsame and electing simultaneous movement of the chains forvraising and lowering the tubing elevator, a plurality of lower support units to support a corresponding plurality of rows of stands of tubing, each of said units having portions adapted'to receive the lower ends of stands of tubing, said support units being movable to )and from a receiving position at the lower ends of the standards and in a plane of said other run of the chains, a corresponding plurality of upper rack units to receive upper portions of rows of stands .of pipe on .said lower support units, and power means for moving said support units and upper rack units to and from tubing receiving position.

References Cited in the tile of this patent UNITED STATESy PATENTS 1,396,262 Davis Nov. 8, 1921 2,531,930 Woolslayer et a1 Nov. 28, 1950 2,535,464 Tisdale Dec. 26, 1950 2,542,176 Bender Feb. 20, 1951 2,628,725 Stone' Feb. 17, 1953 2,653,685 Buck Sept. 29, 1953 2,703,178 Corn Mar. 1, 1955 2,705,520 Jordan May 3, 1955 2,773,605 De Iarnett Dec. 11, 1956 

